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ffmpeg C API documentation/tutorial
Hi!
A have a task to write on-line screen recording using FFmpeg library with C++, but I can't find some documentation, manual, textbook etc. I didn't work with audio-video before at all, I don't know how to start, and can't find where to learn it. Can you help me with that?
In that case, you should check these ffmpeg tutorials.
They show how to open a video file, read/write frames, sync audio and video and a lot more.
Reading the source is unfortunately the only solution.
For understanding H264 there is the reference source code and the H264 book
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How can I create an Outlook PST file using .Net?
How can I write an Outlook PST file with headers? Preferably in .NET, though C++ or anything else would be useful too
I have looked at the PST SDK by Microsoft, but it appears to be read only.
The only code I have found is the CodeProject article "Writing Email to the File of the PST Format", but this code can't write e-mail headers - just body and subject.
Your best bet is to use Microsoft's Messaging API (MAPI). There's plenty of help available online, and there's a sample app called MFC Mapi that one of the Microsoft guys wrote to demonstrate how the API works.
Would the .pst file format documentation be of use to you? From the brief look I took, it seems to document the format itself, so you can implement reading/writing functionality. I don't know how detailed it is, since I haven't used it myself.
http://msdn.microsoft.com/en-us/library/ff385210%28v=office.12%29.aspx
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How to play mp3 file in c++?
Hi,
I am doing a project which demands the functions of mp3 player. There is no need of giant, full pledged solution, all I want is just "play","pause","stop". I found some libs which are libmad,lame.But, I can't find any example for them. If anybody shed a light on this, I will be thankful to them.
Or Is there any way in Qt
There is a Phonon component in Qt 4.
Not sure about Window, but in Ubuntu it can play pretty much every format whose codec is available.
You might look into Qt Docs at http://doc.qt.nokia.com/latest/phonon-overview.html
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Closed 12 years ago.
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Building a simple mp3 music player
I want to create simplest mp3 player in C or C++.
What function or API do I have to use ?
If you just want to write a C or C++ program which plays an mp3 file, you might want to look here: How to play MP3 files in C?.
If you are looking to write something more complex (say a full GUI application to select and play mp3s, including elements to play/pause, jump to a part of the song (and see what part is playing), and view song metadata, etc) than the best advice I can give you is to jump right into your program and start coding. The number of things that would need to be covered to give you an adequate response to a general question are very vast, and we don't know anything about what you are trying to do, what your experience is, or what you might have problems with.
If you jump into it and then ask questions if you get stuck on a part of it, it will overall be a lot more helpful for everyone.
Let me introduce you FMod. It is free for non-commercial use and supports tons of music and sound formats, not only mp3. You should take a look after it for sure! It is so great as simple for use i think.
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I am making an application that involves the use of windows speech recognition. I am thinking of using c++ to do this since i have some experience with this language. The way i want to use the speech recognition is so that it works internally. If i upload an audio file into my program, i want speech recognition to write this audio up as a text file, but all this should be done internally. Please provide some help with this and if i have not explained my question properly please let me know and i will try to explain again.
Thanks in advance,
Divs
(Old question, but no accepted answer, and appears quite high in google)
If you really want to do this in C++, you have to download the SAPI SDK, which does not come standard with Windows : http://www.microsoft.com/downloads/en/details.aspx?FamilyID=5e86ec97-40a7-453f-b0ee-6583171b4530&displaylang=en , select SpeechSDK51.exe
The best documentation you can find on SAPI is not on the web, it's in the SDK itself, in the Docs/ folder. The .chm explains everything really well. Here is an additional link to get you started.
However, it C++ is not a requirement for you, I strongly recommend you do it in C#. It's really much simpler (no COM components, no separate SDK, more doc on MSDN, more tutorials, ...) . See this CodeProject article; you'll have to remove all the GUI stuff, and all the speech synthesis stuff, and you'll see, speech recognition boild down to 10 lines of code. Quite impressive.
EDIT sample code, not compiled, not tested :
using System.Speech;
using System.Speech.Recognition;
// in constructor or initialisation
SpeechRecognitionEngine recognizer = null;
recognizer = new SpeechRecognitionEngine();
recognizer.SetInputToDefaultAudioDevice();
recognizer.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);
recognizer.RecognizeAsync(RecognizeMode.Multiple);
// The callback called when a sentence is recognized
private void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e){
string text = e.Result.Text;
// Do whatever you want with 'text' now
}
ta dah, done
Windows provides speech recognition engines for both clients and servers. Both can be programmed with C++ or with .NET languages. The traditional API for programming in C++ is known as SAPI. The .NET framework namepsaces for client and server speech are System.Speech and Microsoft.Speech.
SAPI documentation - http://msdn.microsoft.com/en-us/library/ms723627(VS.85).aspx
The .NET namespace for client recognition is System.Speech - http://msdn.microsoft.com/en-us/library/system.speech.recognition.aspx. Windows Vista and 7 include the speech engine.
The .NET namespace for server recognition is Microsoft.Speech and the complete SDK for the 10.2 version is available at http://www.microsoft.com/downloads/en/details.aspx?FamilyID=1b1604d3-4f66-4241-9a21-90a294a5c9a4. The speech engine is a free download.
Lots of earlier questions have addressed this. See Prototype based on speech recognition and SAPI and Windows 7 Problem for examples.
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I'm an Electronics and Telecommunications student, next to my graduation. I'm gonna work on a project that involves my knowledge about DSP, music and audio in general. I allready know all the basic mathematic instruments and all the stuff I need to manage it, such as FFT, circular convolution ecc ecc.
I want to learn C++ programming basically for one reason: it's very important in the professional world!!! And I think it's one of the most used to write applications working with audio, especially when it's about real time processing.
Ok, after this small introduction I would like to know first, which are the most used libraries to work with audio processing in c++?? I was longer looking on the web but i couldn't find a lo of working stuff. (I work under linux with eclipse CDT enviroment).
Then I would like to know if there are good sources to learn how to write some working code, such as for example how to write a simple low pass filter. Basically now i will not write real time applications, I would like to start from the processing of a WAV file, or even better an MP3 file, so basically on vectors of samples.
Let's say that basically for now I would like to extract the waveform from an audio file, and save it to a thumbnail or to a PNG image.
Ok, for now I think it's all I would need.
Any ideas, advices, libraries, books, interesting sources about that?
Thanks a lot in advance for any kind of answer.
Giovanni.
I would suggest for you to write your own WAVE file reader and writer in C++, without relying on external libraries. The WAVE format is fairly straight forward, at least if you only intend on supporting the most common wave files.
Then you'll have access to the audio data, which you can easily manipulate in C++. I would recommend starting by modifying the volume, the number of channels to calculating statistics on the audio. Creating a PNG of the audio waveform requires some more advanced C++ skills...
Checkout this link which will give you some information on the available (commercial and open source) audio editing softwares.
Some interesting open source audio editing tools which are written in c++,
Audacity
LMMS
Qtractor
Ardour
Rosegarden
C++ library for audio processing.
SndObj
The Synthesis ToolKit in C++
C++ Code and links related Filters and audio processing..
C++ code for Filter,Audio Processing
Code Guru,Low pass filter
I've used BASS with good results (there's a C/C++ API you can use).